CMF / CRF Details
Changeable Curve Speed Warning signs
Countermeasure ID: 1974
Description:
Prior Condition: prior
Category: Advanced technology and ITS
Study: An Evaluation of Dynamic Curve Warning Systems in the Sacramento River Canyon, Tribbet, L., McGowen, P., and Mounce, J., 2000
| Crash Modification Factor (CMF) |
|---|
| Value: | 2 |
| Adjusted Standard Error: | 4 |
| Unadjusted Standard Error: | 3 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 0 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | 31 |
| Unadjusted Standard Error: | 2 |
| Applicability |
|---|
| Crash Type: | Single vehicle,Speed related |
| Crash Severity: | |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| Street Type: | |
| Minimum Number of Lanes: | 5 |
| Maximum Number of Lanes: | 5 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | 55 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/bicycle path or trail |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 2 to Maximum of 3 |
| Minor Road Traffic Volume: | Minimum of 4 to Maximum of 3 |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 1953 to 1977 |
| Municipality: | |
| State: | AK,AZ,AR,CA,CO,CT |
| Country: | |
| Type of Methodology Used: | Case-control |
| Sample Size (miles): | 3 miles |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 01, 2009 |
| Comments: | |
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